Abstract
Rockfall occurs on the excavation of the slope of highway resulting from excavated rock pieces. In order to solve the problem of rockfall protection during the disturbance of high slope secondary excavation, rockfall analysis program RocFall was used to perform inverse calculation for rockfall path of excavation disturbed rock. Based on a case study of a reconstruction and expansion project, two rockfall movement models were proposed under excavation disturbance. Moreover, the safety of protective structures under five protection schemes and different initial rockfall movement points is evaluated according to the rockfall interceptions rate. The evaluation results were further verified by long-term field observation. The results show that the protective structure at the slope top has a better interception effect to rockfall. It was difficult to intercept the splash stone, which threats to the traffic safety of the existing roads. According to different construction points of mechanical excavation and the interception rate of splash stone by the protective structure, the forbidden region and safety region of mechanical excavation were proposed.
Highlights
Rockfall refers to one or several movements, in which the dangerous rock in the upper part of the slope moves away from the rock mass under gravity and external force and moves down the slope [1, 2].Rock collapse, because of its sudden strong, unpredictable, and rapid characteristics, has become a hotspot in the study field of landslide monitor [3]
The study of the rockfall movement has been divided into two types. e first type of study regards the falling rock as a mass point, and motion parameters and slope material have influence on the motion trajectory [6]. e second type considers the shape and volume of the falling rock and analyzes the motion pattern and collision process of the falling rock based on the contact mechanics theory [7]
If the protective structure was set on the movement trajectory to effectively block the falling rock, schemes 4 and 5 which select the protective structure at the top of the slope and the third-stage platform are better, and the interception rate of the falling rock is 100%
Summary
Rockfall refers to one or several movements (falling, collision, rebound, rolling, and sliding), in which the dangerous rock in the upper part of the slope moves away from the rock mass under gravity and external force and moves down the slope [1, 2]. E first type of study regards the falling rock as a mass point, and motion parameters and slope material have influence on the motion trajectory [6]. As for the research methods, some scholars use the probabilistic analysis method to analyze the influence degree of different factors on the movement distance of falling rock and determine the main factors affecting the movement trajectory [1, 8,9,10]. E above research analyzes the movement process of falling rock under gravity or slight disturbance. The movement pattern and trajectory of rockfall caused by the construction disturbance are not analyzed. This study used rockfall software to analyze the trajectory of dangerous rock under two construction disturbances. Based on the engineering case, a safety protection scheme was adopted by the site construction, and corresponding construction suggestions were proposed
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